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  1. #1

    Member Since
    Mar 30, 2013
    Unhappy "Could not unmount disk" - Trying to clean install lion.
    I open the recovery drive by pressing cmd + R
    Get into the disk utility to reformat the drive, I do everything as usual.
    Then it tells me "Could not unmount disk"

    So I tried to use a time machine save, it did not show me my system drive, only my 50gb partition. (200GB system, 50GB empty partition)

    Then I went onto "install lion" and again, it only showed me my 50gb empty partition to install to.

    Any ideas as to why I can't do anything to my system drive?

  2. #2

    chscag's Avatar
    Member Since
    Jan 23, 2008
    Keller, Texas
    2017 27" iMac, 10.5" iPad Pro, iPhone 6s+, iPhone 7+, Numerous iPods, High Sierra
    It sounds like the recovery partition is all you have on the drive if the system partition is not being seen. Can you post a screen shot of the drive's partitions from Disk Utility?

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